HOLO-KROME 64052 براغي رأس مقبس 5/16-18 × 3/8 بوصة | رأس زر محرك مقبس سداسي | فولاذ سبائك أسود حراري (100/عبوة)

The black oxide finish on these screws looks sharp and should resist rust well in my shop jigs. The hex socket drives seated perfectly without any stripping during install. Exactly what I needed for precise fixture assembly.

Used these to replace some worn fasteners on a milling fixture, and the black oxide finish seems much more durable than plain steel. The hex drive seated perfectly without any stripping. Exactly what I needed for precision tooling work.

Installed these in a jig that sees constant vibration and the black oxide finish hasn’t marred at all. The button head sits flush enough for tight spots and the hex drive grabs securely.